Probing temperature-driven flow lines in a gated two-dimensional electron gas with tunable spin-splitting

Yi Ting Wang*, Gil Ho Kim, C. F. Huang, Shun-Tsung Lo, Wei Jen Chen, J. T. Nicholls, Li Hung Lin, D. A. Ritchie, Y. H. Chang, C. T. Liang, B. P. Dolan

*Corresponding author for this work

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Abstract

We study the temperature flow of conductivities in a gated GaAs two-dimensional electron gas (2DEG) containing self-assembled InAs dots and compare the results with recent theoretical predictions. By changing the gate voltage, we are able to tune the 2DEG density and thus vary disorder and spin-splitting. Data for both the spin-resolved and spin-degenerate phase transitions are presented, the former collapsing to the latter with decreasing gate voltage and/or decreasing spin-splitting. The experimental results support a recent theory, based on modular symmetry, which predicts how the critical Hall conductivity varies with spin-splitting.

Original languageEnglish
Article number405801
JournalJournal of Physics Condensed Matter
Volume24
Issue number40
DOIs
StatePublished - 10 Oct 2012

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    Wang, Y. T., Kim, G. H., Huang, C. F., Lo, S-T., Chen, W. J., Nicholls, J. T., Lin, L. H., Ritchie, D. A., Chang, Y. H., Liang, C. T., & Dolan, B. P. (2012). Probing temperature-driven flow lines in a gated two-dimensional electron gas with tunable spin-splitting. Journal of Physics Condensed Matter, 24(40), [405801]. https://doi.org/10.1088/0953-8984/24/40/405801